JP2021034616A - Semiconductor device - Google Patents

Semiconductor device Download PDF

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JP2021034616A
JP2021034616A JP2019154890A JP2019154890A JP2021034616A JP 2021034616 A JP2021034616 A JP 2021034616A JP 2019154890 A JP2019154890 A JP 2019154890A JP 2019154890 A JP2019154890 A JP 2019154890A JP 2021034616 A JP2021034616 A JP 2021034616A
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region
active region
semiconductor device
current sense
semiconductor substrate
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JP7167881B2 (en
JP2021034616A5 (en
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武寛 加藤
Takehiro Kato
武寛 加藤
忠司 三角
Tadashi Misumi
忠司 三角
準市 上原
Junichi Uehara
準市 上原
侑佑 山下
Yusuke Yamashita
侑佑 山下
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Denso Corp
Toyota Motor Corp
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Denso Corp
Toyota Motor Corp
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Priority to JP2019154890A priority Critical patent/JP7167881B2/en
Priority to CN202080060210.3A priority patent/CN114342064A/en
Priority to PCT/JP2020/012110 priority patent/WO2021038938A1/en
Publication of JP2021034616A publication Critical patent/JP2021034616A/en
Publication of JP2021034616A5 publication Critical patent/JP2021034616A5/ja
Priority to US17/678,105 priority patent/US20220181448A1/en
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Publication of JP7167881B2 publication Critical patent/JP7167881B2/en
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Abstract

To provide a semiconductor device that can maintain an accurate current monitoring function in a semiconductor device manufactured using a SiC substrate.SOLUTION: A semiconductor device includes a semiconductor substrate including an active region where a main switching element structure is formed, a current sense region where the sense switching element structure is formed, and a peripheral region located around the active region and the current sense region. The semiconductor substrate is a 4H-SiC substrate having an off angle in the <11-20> direction. The current sense region is arranged in a range in which the active region does not exist when viewed along the <1-100> direction.SELECTED DRAWING: Figure 1

Description

本明細書が開示する技術は、半導体装置に関する。 The techniques disclosed herein relate to semiconductor devices.

ＳｉＣ基板を用いて製造された半導体装置の開発が進められている。この種の半導体装置のＳｉＣ基板は、メインスイッチング素子構造が形成されているアクティブ領域と、センススイッチング素子構造が形成されている電流センス領域と、アクティブ領域と電流センス領域の周囲に位置する周辺領域と、を有している。電流センス領域は、アクティブ領域の例えば１０００分の１の面積比で構成されている。この種の半導体装置では、電流センス領域を流れる電流を検出し、その検出された電流を面積比に基づくセンス比を用いて換算することにより、アクティブ領域を流れる電流を監視するように構成されている。特許文献１には、この種の半導体装置の一例が開示されている。 Development of semiconductor devices manufactured using SiC substrates is underway. The SiC substrate of this type of semiconductor device has an active region in which a main switching element structure is formed, a current sense region in which a sense switching element structure is formed, and a peripheral region located around the active region and the current sense region. And have. The current sense region is composed of, for example, a 1/1000 area ratio of the active region. This type of semiconductor device is configured to monitor the current flowing in the active region by detecting the current flowing in the current sense region and converting the detected current using the sense ratio based on the area ratio. There is. Patent Document 1 discloses an example of this type of semiconductor device.

特開２０１７−７９３２４号公報JP-A-2017-79324

この種の半導体装置を動作させると、ＳｉＣ基板内に積層欠陥の一種である帯状欠陥が成長することがある。このような帯状欠陥がアクティブ領域内又は電流センス領域内に成長すると、その領域のオン抵抗を増加させる。上記したように、電流センス領域は、比較的に小さい面積で構成されている。このため、電流センス領域内に帯状欠陥が成長すると、電流センス領域のオン抵抗が大きく変動し、電流センス領域を流れる電流が大きく変動する。これにより、アクティブ領域を流れる電流と電流センス領域を流れる電流のセンス比が大きく変動し、アクティブ領域を流れる電流を正確に監視することができなくなってしまう。 When this type of semiconductor device is operated, band-shaped defects, which are a type of stacking defects, may grow in the SiC substrate. When such a band defect grows in the active region or the current sense region, it increases the on-resistance in that region. As described above, the current sense region is composed of a relatively small area. Therefore, when a band-shaped defect grows in the current sense region, the on-resistance of the current sense region fluctuates greatly, and the current flowing in the current sense region fluctuates greatly. As a result, the sense ratio between the current flowing in the active region and the current flowing in the current sense region fluctuates greatly, and it becomes impossible to accurately monitor the current flowing in the active region.

本明細書は、ＳｉＣ基板を用いて製造された半導体装置において、正確な電流監視機能能を維持することができる半導体装置を提供する。 The present specification provides a semiconductor device capable of maintaining an accurate current monitoring function in a semiconductor device manufactured by using a SiC substrate.

本明細書が開示する半導体装置は、メインスイッチング素子構造が形成されているアクティブ領域と、センススイッチング素子構造が形成されている電流センス領域と、前記アクティブ領域と前記電流センス領域の周囲に位置する周辺領域と、を有する半導体基板、を備えることができる。前記半導体基板は、＜１１−２０＞方向にオフ角を有する４Ｈ−ＳｉＣ基板である。前記電流センス領域は、＜１−１００＞方向に沿って見たときに、前記アクティブ領域が存在しない範囲に配置されている。 The semiconductor device disclosed in the present specification is located around the active region in which the main switching element structure is formed, the current sense region in which the sense switching element structure is formed, the active region, and the current sense region. A peripheral region and a semiconductor substrate having the peripheral region can be provided. The semiconductor substrate is a 4H-SiC substrate having an off angle in the <11-20> direction. The current sense region is arranged in a range in which the active region does not exist when viewed along the <1-100> direction.

上記半導体装置が動作すると、前記アクティブ領域内の一部を起点として帯状欠陥が形成され、その帯状欠陥は＜１−１００＞方向に沿って成長する。上記半導体装置では、前記電流センス領域が、＜１−１００＞方向に沿って見たときに、前記アクティブ領域が存在しない範囲に配置されている。このため、前記アクティブ領域内から＜１−１００＞方向に沿って成長する帯状欠陥は、前記電流センス領域内に成長することが抑制される。このため、上記半導体装置では、前記半導体基板内に帯状欠陥が成長しても、前記アクティブ領域を流れる電流と前記電流センス領域を流れる電流のセンス比の変動が抑えられる。上記半導体装置は、正確な電流監視機能能を維持することができる。 When the semiconductor device operates, a band-shaped defect is formed starting from a part of the active region, and the band-shaped defect grows in the <1-100> direction. In the semiconductor device, the current sense region is arranged in a range in which the active region does not exist when viewed along the <1-100> direction. Therefore, the band-shaped defect that grows in the <1-100> direction from the active region is suppressed from growing in the current sense region. Therefore, in the semiconductor device, even if a band-shaped defect grows in the semiconductor substrate, fluctuations in the sense ratio between the current flowing in the active region and the current flowing in the current sense region can be suppressed. The semiconductor device can maintain an accurate current monitoring function.

本実施形態の半導体装置の平面図を模式的に示す。The plan view of the semiconductor device of this embodiment is schematically shown. 本実施形態の半導体装置の要部断面図を模式的に示しており、図１のＩＩ−ＩＩ線に対応した断面である。The cross-sectional view of the main part of the semiconductor device of this embodiment is schematically shown, and is the cross-sectional view corresponding to the line II-II of FIG. 本実施形態の半導体装置の要部断面図を模式的に示しており、図１のＩＩＩ−ＩＩＩ線に対応した断面である。The cross-sectional view of the main part of the semiconductor device of this embodiment is schematically shown, and is a cross-sectional view corresponding to lines III-III of FIG. 本実施形態の半導体装置の平面図を模式的に示しており、形成された帯状欠陥を重ねて示す図である。The plan view of the semiconductor device of this embodiment is schematically shown, and it is the figure which superimposes the formed band-shaped defect. 本実施形態の変形例の半導体装置の平面図を模式的に示す。A plan view of the semiconductor device of the modified example of this embodiment is schematically shown.

以下、図面を参照して本実施形態の半導体装置を説明する。以下で参照する図面は、図示明瞭化を目的として、その縮尺が変更されている。また、図面間の縮尺も必要に応じて変更されている点に留意されたい。 Hereinafter, the semiconductor device of this embodiment will be described with reference to the drawings. The drawings referred to below have been scaled down for clarity. Also note that the scales between the drawings have been changed as needed.

図１に、本実施形態に係る半導体装置１の平面図を模式的に示す。半導体装置１は、半導体基板１０を用いて製造されている。半導体基板１０は、表面が（０００１）面の４Ｈ−ＳｉＣ基板であり、＜１１−２０＞方向にオフ角を有している。 FIG. 1 schematically shows a plan view of the semiconductor device 1 according to the present embodiment. The semiconductor device 1 is manufactured by using the semiconductor substrate 10. The semiconductor substrate 10 is a 4H-SiC substrate whose surface is a (0001) plane, and has an off angle in the <11-20> direction.

半導体基板１０は、アクティブ領域１０Ａと、電流センス領域１０Ｂと、アクティブ領域１０Ａと電流センス領域１０Ｂの周囲に位置する周辺領域１０Ｃと、を有している。この例では、アクティブ領域１０Ａは、一対の矩形状の部分領域を有しており、一方の部分領域を第１アクティブ領域１０Ａａといい、他方の部分領域を第２アクティブ領域１０Ａｂという。 The semiconductor substrate 10 has an active region 10A, a current sense region 10B, and a peripheral region 10C located around the active region 10A and the current sense region 10B. In this example, the active region 10A has a pair of rectangular partial regions, one partial region is referred to as a first active region 10Aa, and the other partial region is referred to as a second active region 10Ab.

半導体基板１０のアクティブ領域１０Ａには、後述するように、ＭＯＳＦＥＴ（Metal-Oxide-Semiconductor Field-Effect Transistor）を構成するメインスイッチング素子構造が形成されている。半導体基板１０の電流センス領域１０Ｂにも、ＭＯＳＦＥＴを構成するセンススイッチング素子構造が形成されている。メインスイッチング素子構造とセンススイッチング素子構造の単位セルは共通である。半導体基板１０の周辺領域１０Ｃ内には、ガードリング等の周辺耐圧構造が形成されている。さらに、半導体基板１０の周辺領域１０Ｃ上には、温度センス素子４０と、複数種類の小信号パッド５０と、が設けられている。 As will be described later, a main switching element structure constituting a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) is formed in the active region 10A of the semiconductor substrate 10. A sense switching element structure constituting a MOSFET is also formed in the current sense region 10B of the semiconductor substrate 10. The unit cell of the main switching element structure and the sense switching element structure is common. A peripheral pressure resistant structure such as a guard ring is formed in the peripheral region 10C of the semiconductor substrate 10. Further, a temperature sense element 40 and a plurality of types of small signal pads 50 are provided on the peripheral region 10C of the semiconductor substrate 10.

図２に、図１のＩＩ−ＩＩ線に対応した断面図を模式的に示す。図３に、図１のＩＩＩ−ＩＩＩ線に対応した断面図を模式的に示す。図２及び図３に示されるように、アクティブ領域１０Ａと電流センス領域１０Ｂの各々に形成されているＭＯＳＦＥＴは、ドレイン電極２２と、ソース電極２４と、トレンチゲート部３０と、を備えている。 FIG. 2 schematically shows a cross-sectional view corresponding to line II-II of FIG. FIG. 3 schematically shows a cross-sectional view corresponding to lines III-III of FIG. As shown in FIGS. 2 and 3, the MOSFET formed in each of the active region 10A and the current sense region 10B includes a drain electrode 22, a source electrode 24, and a trench gate portion 30.

ドレイン電極２２は、半導体基板１０の裏面上に設けられている。ソース電極２４は、半導体基板１０のうちのアクティブ領域１０Ａ及び電流センス領域１０Ｂ上に設けられている。トレンチゲート部３０は、半導体基板１０のうちのアクティブ領域１０Ａ及び電流センス領域１０Ｂの表層部に設けられており、ゲート電極３２及びゲート絶縁膜３４を有している。ゲート電極３２は、ゲート絶縁膜３４によって半導体基板１０から絶縁されている。 The drain electrode 22 is provided on the back surface of the semiconductor substrate 10. The source electrode 24 is provided on the active region 10A and the current sense region 10B of the semiconductor substrate 10. The trench gate portion 30 is provided on the surface layer portion of the active region 10A and the current sense region 10B of the semiconductor substrate 10, and has a gate electrode 32 and a gate insulating film 34. The gate electrode 32 is insulated from the semiconductor substrate 10 by the gate insulating film 34.

半導体基板１０には、ｎ+型のドレイン領域１１と、ｎ型のドリフト領域１２と、ｐ型のボディ領域１３と、ｐ+型のボディコンタクト領域１４と、ｎ+型のソース領域１５と、ｐ型のディープ領域１６と、が形成されている。 The semiconductor substrate 10 includes an n + type drain region 11, an n type drift region 12, a p type body region 13, a p + type body contact region 14, and an n + type source region 15. A p-type deep region 16 is formed.

ドレイン領域１１は、半導体基板１０の裏層部に設けられており、半導体基板１０の裏面に露出する位置に配置されている。ドレイン領域１１は、ドリフト領域１２をエピタキシャル成長するための下地基板である。ドレイン領域１１は、半導体基板１０の裏面を被覆するドレイン電極２２にオーミック接触している。 The drain region 11 is provided on the back layer portion of the semiconductor substrate 10 and is arranged at a position exposed on the back surface of the semiconductor substrate 10. The drain region 11 is a base substrate for epitaxially growing the drift region 12. The drain region 11 is in ohmic contact with the drain electrode 22 that covers the back surface of the semiconductor substrate 10.

ドリフト領域１２は、ドレイン領域１１上に設けられており、ドレイン領域１１とボディ領域１３を隔てている。ドリフト領域１２は、エピタキシャル成長技術を利用して、ドレイン領域１１の表面から結晶成長して形成される。 The drift region 12 is provided on the drain region 11 and separates the drain region 11 from the body region 13. The drift region 12 is formed by crystal growth from the surface of the drain region 11 by utilizing an epitaxial growth technique.

ボディ領域１３は、アクティブ領域１０Ａと電流センス領域１０Ｂに対応する位置のドリフト領域１２上に設けられており、半導体基板１０の表層部に配置されている。ボディ領域１３は、イオン注入技術を利用して、半導体基板１０の表面に向けてアルミニウムをイオン注入し、半導体基板１０の表層部に形成される。 The body region 13 is provided on the drift region 12 at positions corresponding to the active region 10A and the current sense region 10B, and is arranged on the surface layer portion of the semiconductor substrate 10. The body region 13 is formed on the surface layer portion of the semiconductor substrate 10 by ion-implanting aluminum toward the surface of the semiconductor substrate 10 by using the ion implantation technique.

ボディコンタクト領域１４は、ボディ領域１３上に設けられており、半導体基板１０の表層部に位置しており、半導体基板１０の表面に露出する位置に配置されている。ボディコンタクト領域１４は、ボディ領域１３よりもｐ型不純物の濃度が濃い領域であり、ソース電極２４にオーミック接触している。これにより、ボディ領域１３は、ボディコンタクト領域１４を介してソース電極２４に電気的に接続されている。ボディコンタクト領域１４は、イオン注入技術を利用して、半導体基板１０の表面に向けてアルミニウムをイオン注入し、半導体基板１０の表層部に形成される。 The body contact region 14 is provided on the body region 13, is located on the surface layer portion of the semiconductor substrate 10, and is arranged at a position exposed on the surface of the semiconductor substrate 10. The body contact region 14 is a region in which the concentration of p-type impurities is higher than that of the body region 13, and is in ohmic contact with the source electrode 24. As a result, the body region 13 is electrically connected to the source electrode 24 via the body contact region 14. The body contact region 14 is formed on the surface layer portion of the semiconductor substrate 10 by ion-implanting aluminum toward the surface of the semiconductor substrate 10 by using the ion implantation technique.

ソース領域１５は、ボディ領域１３上に設けられており、半導体基板１０の表層部に位置しており、半導体基板１０の表面に露出する位置に配置されている。ソース領域１５は、ボディ領域１３によってドリフト領域１２から隔てられているとともにトレンチゲート部３０の側面に接している。ソース領域１５は、ソース電極２４にオーミック接触している。ソース領域１５は、イオン注入技術を利用して、半導体基板１０の表面に向けて窒素をイオン注入し、半導体基板１０の表層部に形成される。 The source region 15 is provided on the body region 13, is located on the surface layer portion of the semiconductor substrate 10, and is arranged at a position exposed on the surface of the semiconductor substrate 10. The source region 15 is separated from the drift region 12 by the body region 13 and is in contact with the side surface of the trench gate portion 30. The source region 15 is in ohmic contact with the source electrode 24. The source region 15 is formed on the surface layer portion of the semiconductor substrate 10 by ion-implanting nitrogen toward the surface of the semiconductor substrate 10 by using the ion implantation technique.

ディープ領域１６は、ボディ領域１３に隣接して設けられており、半導体基板１０の表層部に位置しており、半導体基板１０の表面に露出する位置に配置されている。ディープ領域１６は、アクティブ領域１０Ａと周辺領域１０Ｃの境界、及び、電流センス領域１０Ｂと周辺領域１０Ｃの境界に沿って形成されている。ディープ領域１６は、ボディ領域１３よりも深く形成されている。ディープ領域１６は、イオン注入技術を利用して、半導体基板１０の表面に向けてボロンをイオン注入し、半導体基板１０の表層部に形成される。 The deep region 16 is provided adjacent to the body region 13, is located on the surface layer portion of the semiconductor substrate 10, and is arranged at a position exposed on the surface of the semiconductor substrate 10. The deep region 16 is formed along the boundary between the active region 10A and the peripheral region 10C and the boundary between the current sense region 10B and the peripheral region 10C. The deep region 16 is formed deeper than the body region 13. The deep region 16 is formed on the surface layer portion of the semiconductor substrate 10 by ion-implanting boron toward the surface of the semiconductor substrate 10 by using the ion implantation technique.

このように、アクティブ領域１０Ａと電流センス領域１０Ｂの各々には、単位セルを共通とするＭＯＳＦＥＴが形成されている。電流センス領域１０Ｂは、アクティブ領域１０Ａの例えば１０００分の１の面積比で構成されている。半導体装置１では、電流センス領域１０Ｂを流れる電流を検出し、その検出された電流を面積比に基づくセンス比を用いて換算することにより、アクティブ領域１０Ａを流れる電流を監視するように構成されている。 As described above, MOSFETs having a common unit cell are formed in each of the active region 10A and the current sense region 10B. The current sense region 10B is composed of, for example, 1/1000 of the area ratio of the active region 10A. The semiconductor device 1 is configured to monitor the current flowing through the active region 10A by detecting the current flowing through the current sense region 10B and converting the detected current using the sense ratio based on the area ratio. There is.

ここで、半導体基板１０の周辺領域１０Ｃの表層部には、ガードリング構造又はリサーフ構造等の周辺耐圧構造が形成されているが、図２及び図３では、図示明瞭化を目的として、そのような周辺耐圧構造を省略して図示している。 Here, a peripheral pressure-resistant structure such as a guard ring structure or a resurf structure is formed on the surface layer portion of the peripheral region 10C of the semiconductor substrate 10, but in FIGS. The peripheral pressure-resistant structure is omitted in the figure.

図３に示されるように、温度センス素子４０は、半導体基板の周辺領域１０Ｃ上に設けられており、半導体基板１０上の層間絶縁膜上に成膜されたポリシリコン層を用いて構成されている。温度センス素子４０は、ｐ型のアノード領域４２とｎ型のカソード領域４４を有しており、このアノード領域４２とカソード領域４４が隣接して構成されたダイオード素子である。温度センス素子４０は、イオン注入技術を利用して、ポリシリコン層にｐ型不純物とｎ型不純物をイオン注入することで形成されている。温度センス素子４０は、温度変化に依存して順方向電圧が変化する特性を利用して温度を検知するものである。なお、この例では、温度センス素子４０が半導体基板１０上に設けられているが、この例に代えて、半導体基板１０内に設けられていてもよい。 As shown in FIG. 3, the temperature sense element 40 is provided on the peripheral region 10C of the semiconductor substrate, and is configured by using a polysilicon layer formed on the interlayer insulating film on the semiconductor substrate 10. There is. The temperature sense element 40 is a diode element having a p-type anode region 42 and an n-type cathode region 44, and the anode region 42 and the cathode region 44 are adjacent to each other. The temperature sense element 40 is formed by ion-implanting p-type impurities and n-type impurities into the polysilicon layer by using an ion implantation technique. The temperature sense element 40 detects the temperature by utilizing the characteristic that the forward voltage changes depending on the temperature change. In this example, the temperature sense element 40 is provided on the semiconductor substrate 10, but instead of this example, it may be provided in the semiconductor substrate 10.

図１に戻る。半導体装置１では、電流センス領域１０Ｂが、＜１−１００＞方向に沿って見たときに、アクティブ領域１０Ａが存在しない範囲に配置されている。より具体的には、電流センス領域１０Ｂは、＜１−１００＞方向に沿って見たときに、第１アクティブ領域１０Ａａと第２アクティブ領域１０Ａｂの間に配置されている。また、電流センス領域１０Ｂは、小信号パッド５０間に配置されている。より具体的には、電流センス領域１０Ｂは、＜１１−２０＞方向において、小信号パッド５０間に配置されている。 Return to FIG. In the semiconductor device 1, the current sense region 10B is arranged in a range in which the active region 10A does not exist when viewed along the <1-100> direction. More specifically, the current sense region 10B is arranged between the first active region 10Aa and the second active region 10Ab when viewed along the <1-100> direction. Further, the current sense region 10B is arranged between the small signal pads 50. More specifically, the current sense region 10B is arranged between the small signal pads 50 in the <11-20> direction.

また、半導体装置１では、温度センス素子４０が、第１アクティブ領域１０Ａａと第２アクティブ領域１０Ａｂの間に位置する周辺領域１０Ｃに配置されている。このように、温度センス素子４０と電流センス領域１０Ｂは、＜１１−２０＞方向において対向するように配置されている。 Further, in the semiconductor device 1, the temperature sense element 40 is arranged in the peripheral region 10C located between the first active region 10Aa and the second active region 10Ab. In this way, the temperature sense element 40 and the current sense region 10B are arranged so as to face each other in the <11-20> direction.

次に、図４を参照して、半導体装置１の特徴を説明する。上記したように、半導体装置１は、下地基板であるドレイン領域１１の表面からドリフト領域１２をエピタキシャル成長して形成されている。このため、よく知られているように、ドレイン領域１１とドリフト領域１２の界面付近には、基底面転位（Basal Plane Dislocation : BPD）及び基底面転位から変換された貫通刃状転位（Threading Edge Dislocation : TED）が存在している。 Next, the features of the semiconductor device 1 will be described with reference to FIG. As described above, the semiconductor device 1 is formed by epitaxially growing the drift region 12 from the surface of the drain region 11 which is the base substrate. Therefore, as is well known, near the interface between the drain region 11 and the drift region 12, there is a Basal Plane Dislocation (BPD) and a threading edge dislocation converted from the basal dislocation. : TED) exists.

半導体装置１のスイッチング動作において、ソース電極２４の電位がドレイン電極２２の電位よりも高くなる逆バイアスモードが発生する。このような逆バイアスモードでは、ボディ領域１３とドリフト領域１２で構成される内蔵ｐｎダイオードが順バイアスされるので、内蔵ｐｎダイオードが還流ダイオードとして動作することができる。これにより、逆バイアスモードでは、ボディ領域１３からドリフト領域１２に正孔が注入される。このとき、注入された正孔が基底面転位又は貫通刃状転位に達すると、これら転位を起点とする積層欠陥を拡張し、半導体基板１０内に帯状欠陥１００が現れる。このような帯状欠陥１００は、＜１−１００＞方向に沿って成長し、その幅が２００μｍ程度にまで達することがある。 In the switching operation of the semiconductor device 1, a reverse bias mode is generated in which the potential of the source electrode 24 is higher than the potential of the drain electrode 22. In such a reverse bias mode, the built-in pn diode composed of the body region 13 and the drift region 12 is forward-biased, so that the built-in pn diode can operate as a freewheeling diode. As a result, in the reverse bias mode, holes are injected from the body region 13 into the drift region 12. At this time, when the injected holes reach the basal plane dislocation or the through-blade dislocation, the stacking defects originating from these dislocations are expanded, and the band-shaped defects 100 appear in the semiconductor substrate 10. Such a band-shaped defect 100 grows along the <1-100> direction, and its width may reach about 200 μm.

上記したように、このような帯状欠陥１００は、内蔵ｐｎダイオードの動作によって注入された正孔が基底面転位又は貫通刃状転位に達することで形成される。このため、このような帯状欠陥１００は、アクティブ領域１０Ａに存在する基底面転位又は貫通刃状転位を起点として形成され、＜１１−２０＞方向に沿って成長する。 As described above, such a band-shaped defect 100 is formed when the holes injected by the operation of the built-in pn diode reach the basal plane dislocation or the through-blade dislocation. Therefore, such a band-shaped defect 100 is formed starting from a basal plane dislocation or a through-blade dislocation existing in the active region 10A, and grows along the <11-20> direction.

半導体装置１では、電流センス領域１０Ｂが、＜１−１００＞方向に沿って見たときに、アクティブ領域１０Ａが存在しない範囲に配置されている。このため、半導体装置１では、アクティブ領域１０Ａから成長してくる帯状欠陥１００は、電流センス領域１０Ｂを通過することが抑制されている。 In the semiconductor device 1, the current sense region 10B is arranged in a range in which the active region 10A does not exist when viewed along the <1-100> direction. Therefore, in the semiconductor device 1, the band-shaped defect 100 growing from the active region 10A is suppressed from passing through the current sense region 10B.

仮に、帯状欠陥１００が電流センス領域１０Ｂ内に成長すると、電流センス領域１０Ｂのオン抵抗を増加させる。上記したように、電流センス領域１０Ｂは、比較的に小さい面積で構成されている。このため、電流センス領域１０Ｂ内に帯状欠陥１００が成長すると、電流センス領域１０Ｂのオン抵抗が大きく変動し、電流センス領域１０Ｂを流れる電流が大きく変動する。これにより、アクティブ領域１０Ａを流れる電流と電流センス領域１０Ｂを流れる電流のセンス比が大きく変動し、アクティブ領域１０Ａを流れる電流を正確に監視することができなくなってしまう。 If the band-shaped defect 100 grows in the current sense region 10B, the on-resistance of the current sense region 10B is increased. As described above, the current sense region 10B is composed of a relatively small area. Therefore, when the band-shaped defect 100 grows in the current sense region 10B, the on-resistance of the current sense region 10B fluctuates greatly, and the current flowing through the current sense region 10B fluctuates greatly. As a result, the sense ratio of the current flowing through the active region 10A and the current flowing through the current sense region 10B fluctuates greatly, and the current flowing through the active region 10A cannot be accurately monitored.

一方、半導体装置１では、上記したように、帯状欠陥１００が電流センス領域１０Ｂ内に成長することが抑制されている。アクティブ領域１０Ａ内に帯状欠陥１００が形成されるものの、アクティブ領域１０Ａは比較的に大きい面積で構成されていることから、オン抵抗の変動が小さい。このため、半導体装置１では、半導体基板１０内に帯状欠陥１００が形成されても、アクティブ領域１０Ａを流れる電流と電流センス領域１０Ｂを流れる電流のセンス比の変動が抑えられる。したがって、半導体装置１は、正確な電流監視機能能を維持することができる。 On the other hand, in the semiconductor device 1, as described above, the band-shaped defect 100 is suppressed from growing in the current sense region 10B. Although the band-shaped defect 100 is formed in the active region 10A, since the active region 10A is composed of a relatively large area, the fluctuation of the on-resistance is small. Therefore, in the semiconductor device 1, even if the band-shaped defect 100 is formed in the semiconductor substrate 10, the fluctuation of the sense ratio between the current flowing in the active region 10A and the current flowing in the current sense region 10B can be suppressed. Therefore, the semiconductor device 1 can maintain an accurate current monitoring function.

また、半導体装置１では、電流センス領域１０Ｂが、＜１−１００＞方向に沿って見たときに、第１アクティブ領域１０Ａａと第２アクティブ領域１０Ａｂの間に配置されている。第１アクティブ領域１０Ａａと第２アクティブ領域１０Ａｂの間の周辺領域１０Ｃは、ゲート電極３２に接続される配線及び温度センス素子４０に接続される配線等を配設するために確保されるべき領域である。さらに、半導体装置１では、第１アクティブ領域１０Ａａと第２アクティブ領域１０Ａｂの間の周辺領域１０Ｃに温度センス素子４０が設けられている。すなわち、電流センス領域１０Ｂは、各種配線及び温度センス素子４０を配置する目的でアクティブ領域１０Ａが形成されない領域に対応して配置されている。したがって、半導体装置１では、アクティブ領域１０Ａの面積を減らすことなく、＜１−１００＞方向に沿ってアクティブ領域１０Ａが存在しない位置関係で電流センス領域１０Ｂを配置することができる。 Further, in the semiconductor device 1, the current sense region 10B is arranged between the first active region 10Aa and the second active region 10Ab when viewed along the <1-100> direction. The peripheral region 10C between the first active region 10Aa and the second active region 10Ab is an region to be secured for arranging the wiring connected to the gate electrode 32, the wiring connected to the temperature sense element 40, and the like. is there. Further, in the semiconductor device 1, the temperature sense element 40 is provided in the peripheral region 10C between the first active region 10Aa and the second active region 10Ab. That is, the current sense region 10B is arranged corresponding to a region in which the active region 10A is not formed for the purpose of arranging various wirings and the temperature sense element 40. Therefore, in the semiconductor device 1, the current sense region 10B can be arranged along the <1-100> direction in a positional relationship in which the active region 10A does not exist, without reducing the area of the active region 10A.

なお、上記実施形態では、アクティブ領域１０Ａが、一対の部分領域、すなわち、第１アクティブ領域１０Ａａと第２アクティブ領域１０Ａｂで構成されている場合を例示した。図５に示されるように、アクティブ領域１０Ａを構成する部分領域の数が３つであってもよい。この場合も、電流センス領域１０Ｂは、＜１−１００＞方向に沿って見たときに、アクティブ領域１０Ａの部分領域間に配置されている。なお、アクティブ領域１０Ａを構成する部分領域の数が４つ以上であっても同様である。また、電流センス領域１０Ｂと温度センス素子４０は、＜１１−２０＞方向において対向するように配置されていてもよいし、＜１１−２０＞方向において対向するように配置されていなくてもよい。 In the above embodiment, the case where the active region 10A is composed of a pair of partial regions, that is, the first active region 10Aa and the second active region 10Ab is illustrated. As shown in FIG. 5, the number of subregions constituting the active region 10A may be three. Also in this case, the current sense region 10B is arranged between the partial regions of the active region 10A when viewed along the <1-100> direction. The same applies even if the number of partial regions constituting the active region 10A is four or more. Further, the current sense region 10B and the temperature sense element 40 may be arranged so as to face each other in the <11-20> direction, or may not be arranged so as to face each other in the <11-20> direction. ..

以上、本発明の具体例を詳細に説明したが、これらは例示に過ぎず、特許請求の範囲を限定するものではない。特許請求の範囲に記載の技術には、以上に例示した具体例を様々に変形、変更したものが含まれる。本明細書または図面に説明した技術要素は、単独であるいは各種の組合せによって技術的有用性を発揮するものであり、出願時請求項記載の組合せに限定されるものではない。また、本明細書または図面に例示した技術は複数目的を同時に達成するものであり、そのうちの一つの目的を達成すること自体で技術的有用性を持つものである。 Although specific examples of the present invention have been described in detail above, these are merely examples and do not limit the scope of claims. The techniques described in the claims include various modifications and modifications of the specific examples illustrated above. The technical elements described herein or in the drawings exhibit their technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques illustrated in this specification or drawings achieve a plurality of objectives at the same time, and achieving one of the objectives itself has technical usefulness.

１ ：半導体装置
１０ ：半導体基板
１０Ａ ：アクティブ領域
１０Ａａ ：第１アクティブ領域
１０Ａｂ ：第２アクティブ領域
１０Ｂ ：周辺領域
１０Ｃ ：電流センス領域
１１ ：ドレイン領域
１２ ：ドリフト領域
１３ ：ボディ領域
１４ ：ボディコンタクト領域
１５ ：ソース領域
１６ ：ディープ領域
２２ ：ドレイン電極
２４ ：ソース電極
３０ ：トレンチゲート部
３２ ：ゲート電極
３４ ：ゲート絶縁膜
４０ ：温度センス素子
４２ ：アノード領域
４４ ：カソード領域
５０ ：小信号パッド 1: Semiconductor device 10: Semiconductor substrate 10A: Active region 10Aa: First active region 10Ab: Second active region 10B: Peripheral region 10C: Current sense region 11: Drain region 12: Drift region 13: Body region 14: Body contact region 15: Source region 16: Deep region 22: Drain electrode 24: Source electrode 30: Trench gate portion 32: Gate electrode 34: Gate insulating film 40: Temperature sense element 42: Anode region 44: Cathode region 50: Small signal pad

Claims (3)

半導体装置であって、
メインスイッチング素子構造が形成されているアクティブ領域と、センススイッチング素子構造が形成されている電流センス領域と、前記アクティブ領域と前記電流センス領域の周囲に位置する周辺領域と、を有している半導体基板、を備えており、
前記半導体基板は、＜１１−２０＞方向にオフ角を有する４Ｈ−ＳｉＣ基板であり、
前記電流センス領域は、＜１−１００＞方向に沿って見たときに、前記アクティブ領域が存在しない範囲に配置されている、半導体装置。 It is a semiconductor device
A semiconductor having an active region in which a main switching element structure is formed, a current sense region in which a sense switching element structure is formed, and a peripheral region located around the active region and the current sense region. Equipped with a board,
The semiconductor substrate is a 4H-SiC substrate having an off angle in the <11-20> direction.
A semiconductor device in which the current sense region is arranged in a range in which the active region does not exist when viewed along the <1-100> direction. 前記アクティブ領域は、第１アクティブ領域と第２アクティブ領域を有しており、
前記第１アクティブ領域と前記第２アクティブ領域は、前記半導体基板内で離間して配置されており、
前記電流センス領域は、＜１−１００＞方向に沿って見たときに、前記第１アクティブ領域と前記第２アクティブ領域の間に配置されている、請求項１に記載の半導体装置。 The active region has a first active region and a second active region.
The first active region and the second active region are arranged apart from each other in the semiconductor substrate.
The semiconductor device according to claim 1, wherein the current sense region is arranged between the first active region and the second active region when viewed along the <1-100> direction. 温度センス素子をさらに備えており、
前記温度センス素子は、前記第１アクティブ領域と前記第２アクティブ領域の間に位置する前記周辺領域に配置されている、請求項２に記載の半導体装置。 It also has a temperature sense element,
The semiconductor device according to claim 2, wherein the temperature sense element is arranged in the peripheral region located between the first active region and the second active region.
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